3,068 research outputs found
Multivariate Design of Experiments for Engineering Dimensional Analysis
We consider the design of dimensional analysis experiments when there is more
than a single response. We first give a brief overview of dimensional analysis
experiments and the dimensional analysis (DA) procedure. The validity of the DA
method for univariate responses was established by the Buckingham -Theorem
in the early 20th century. We extend the theorem to the multivariate case,
develop basic criteria for multivariate design of DA and give guidelines for
design construction. Finally, we illustrate the construction of designs for DA
experiments for an example involving the design of a heat exchanger
International Space Station (ISS) Gas Logistics Planning in the Post Shuttle Era
Over its life the International Space Station (ISS) has received gas (nitrogen, oxygen, and air) from various sources. Nitrogen and oxygen are used in the cabin to maintain total pressure and oxygen partial pressures within the cabin. Plumbed nitrogen is also required to support on-board experiments and medical equipment. Additionally, plumbed oxygen is required to support medical equipment as well as emergency masks and most importantly EVA support. Gas are supplied to ISS with various methods and vehicles. Vehicles like the Progress and ATV deliver nitrogen (both as a pure gas and as air) and oxygen via direct releases into the cabin. An additional source of nitrogen and oxygen is via tanks on the ISS Airlock. The Airlock nitrogen and oxygen tanks can deliver to various users via pressurized systems that run throughout the ISS except for the Russian segment. Metabolic oxygen is mainly supplied via cabin release from the Elektron and Oxygen Generator Assembly (OGA), which are water electrolyzers. As a backup system, oxygen candles (Solid Fuel Oxygen Generators-SFOGs) supply oxygen to the cabin as well. In the past, a major source of nitrogen and oxygen has come from the Shuttle via both direct delivery to the cabin as well as to recharge the ISS Airlock tanks. To replace the Shuttle capability to recharge the ISS Airlock tanks, a new system was developed called Nitrogen/Oxygen Recharge System (NORS). NIORS consists of high pressure (7000 psi) tanks which recharge the ISS Airlock tanks via a blowdown fill for both nitrogen and oxygen. NORS tanks can be brought up on most logistics vehicles such as the HTV, COTS, and ATV. A proper balance must be maintained to insure sufficient gas resources are available on-orbit so that all users have the required gases via the proper delivery method (cabin and/or plumbed)
Accounting Hall of Fame 2000 induction: Charles W. Haskins
For the induction of Charles W. Haskins: Remarks by J. Michael Cook; Citation prepared by Daniel L. Jensen, The Ohio State University, read by J. Michael Coo
Context-Bounded Analysis For Concurrent Programs With Dynamic Creation of Threads
Context-bounded analysis has been shown to be both efficient and effective at
finding bugs in concurrent programs. According to its original definition,
context-bounded analysis explores all behaviors of a concurrent program up to
some fixed number of context switches between threads. This definition is
inadequate for programs that create threads dynamically because bounding the
number of context switches in a computation also bounds the number of threads
involved in the computation. In this paper, we propose a more general
definition of context-bounded analysis useful for programs with dynamic thread
creation. The idea is to bound the number of context switches for each thread
instead of bounding the number of switches of all threads. We consider several
variants based on this new definition, and we establish decidability and
complexity results for the analysis induced by them
Trending of Overboard Leakage of ISS Cabin Atmosphere
The International Space Station (ISS) overboard leakage of cabin atmosphere is continually tracked to identify new or aggravated leaks and to provide information for planning of nitrogen supply to the ISS. The overboard leakage is difficult to trend with various atmosphere constituents being added and removed. Changes to nitrogen partial pressure is the nominal means of trending the overboard leakage. This paper summarizes the method of the overboard leakage trending and presents findings from the trending
Accounting Hall of fame 1999 induction: J. Michael Cook
For J. Michael Cook\u27s induction there were: Remarks by Oscar Gellein, Haskins & Sells, retired; citation written by Daniel L. Jensen, The Ohio State University; response by J. Michael Cook, Deloitte & Touche, retired
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